This lamp is designed for physics lab in university. A high brightness bromine tungsten light bulb adopted  provides incoherent white light. The wide wavelength range 350 to 2500 nm provides various applications in visible band.
You can freely control  the brightness of this lamp with a knob on the power supply.
A piece of frosted glass is used for producing even area light. And all types of diaphragm can be attached at the output.
Matt painted surface reduces stray light.